วันอาทิตย์ที่ 28 สิงหาคม พ.ศ. 2554

Understanding of imitation and synthetic gemstones

Stones or synthetic lab-created gemstones, as the name suggests, are made in a laboratory. Synthetic gems are not the rarity of the stones natural color and are less expensive than natural stones extracted. Due to the nature, synthetic gems can be made show subtle differences in shape and color to distinguish them from their natural counterparts. A synthetic gemstone is identical to a natural gemstone in almost every aspect. This includes the same basicCrystal structure, refractive index, density, chemical composition, colors and other characteristics.

Since the same gemological tests for the identification of natural and synthetic stone precious stones are used, sometimes it is also a gemologist on, not whether a stone is natural or synthetic, can be confused. These stones can be made of colorless, or through the use of metal oxides, in many colors, and may resemble natural stone from many, including theAmethyst, diamond, spinel, emerald, opal, and corundum (ruby and sapphire). Alexandrite.

Lapis lazuli, turquoise and coral from the French manufacturer, Gilson are made are similar to their natural counterparts, but are not true, the plastic, because their optical and physical properties are different from natural gemstones. Gilson Lapis, for example, is porous and has a specific gravity lower.

Process for the production of synthetic gems

Growth from melt:

* The Flame and FusionVerneuil process Originally developed (1902) French chemist Auguste Verneuil a, with the method, a sphere (a mass of alumina with the same physical and chemical characteristics as corundum) from finely ground alumina (Al2O3) from an inverted oxyhydrogen torch that opens into a ceramic muffle. With slight modifications, this method is used to produce spinel, rutile, and strontium.

Verneuil process for the production of jewels, a bar down with a "seed" inminerals and then melted again. Repeat this process again and again grows a large crystal at the end of a rod from ore zone. Ruby is then removed and polished.

* Pull or Czochralski technique A method of growing synthetic crystals with high melting point of the Polish scientist Jan Czochralski, who discovered the method in 1916, when the investigations of the rates of crystallization of metals developed. Czochralski crystal pulling and is called as factoriesTechnology. When a seed crystal is lowered gently until it moved to the opposite of pure melt in the crucible, and then slowly upward. The product, in auction-shaped crystals. It is used for rare earth garnets, lithium, synthetic alexandrite synthetic scheelite and do.

* Brigman-Stockbarger Technology The method involves heating polycrystalline material in a container above its melting point and cooling slowly from one end of which is a crystal seed. SingleCrystal material is progressively formed along the length of the container. The procedure can be performed in a horizontal or vertical geometry. Growth from solution:

* Hydrothermal Method

Aquamarine and quartz crystals in a solution in an autoclave, where they controlled the temperature and pressure to create the raw material to be grown in the hottest part Lascas name. Crystals of seeds are in the coldest part of which the form of synthetic quartz glass Lascas redeposit. This processcan grow 30 to 60 days, and is also used for the amethyst, citrine and rock crystal.

* Melt Flux Method Launched by the French chemist Edmond Fremy, fluidity and technique still used to make emeralds. The ingredients are blended powder and mixed in a solvent (flux) in a crucible. The material must be stored for months at a very high temperature before being allowed to cool very slowly.

* High temperature / pressure method: A type of high growth in water solutionTemperature and pressure is known as the hydrothermal technique. Growth from solution is achieved by increasing the saturation. As the addition of increasing amounts of sugar, water, sugar dissolves until the solution is saturated and can absorb more and then begin to re-crystallize. Crystallization subcooling increases and with it will reduce the heating. A crystal seed is often delivered to start the crystallization and starting point for a deposition.The crystal growth rates are a function of time, temperature and concentration. Hydrothermal techniques are used to emeralds, to make quartz, rock crystal and amethyst.

* Skull melting process This process was perfected in the USSR, in particular to crystallize synthetic cubic zirconia, for applications in optics, electronics and lasers. Cubic zirconia has a very high melting temperature and is a very reactive material. No container can solve this because it has a melting point of zirconiaof 2750 ° C and then a cold or the skull crucible is used.

Imitation stones can be made from any material such as glass, paste or crystal, ceramic, porcelain, acrylic and plastic. Ceramics are the most common food simulants and less expensive and are used as replacements for many popular types of gemstones such as turquoise, coral, jade, pearls. Imitation stones are to simulate a particular gemstone, but do not have the same chemical, physical and optical properties ofto distinguish natural gems such as synthetic gem and can therefore easily be synthetic and natural gemstones. Volcanic glass, a man-made substance, which are made of obsidian, volcanic ash, is a possible candidate for imitation aquamarine and light sapphire. Some examples of imitation stones are cubic zirconia, synthetic moissanite (Diamond) and yttrium-aluminum-garnet, diamond imitations. Since diamonds are so valuable and popular, the diamond market is huge and fraudMany additional simulants as cubic zirconia, GGG, YAG, strontium titanate, synthetic rutile and moissanite have emerged over the past 50 years. Other imitation stones of emerald doublet, Foil Glass (Opal), imitation lapis lazuli, Synthetic forsterite (tanzanite), synthetic forsterite (peridot).

Moissanite rings are becoming popular as a substitute for diamonds. It has almost the same appearance and quality as diamond rings. It 's almost impossible for someone, the difference between this band and diamond rings to tell. Because of the high technology and development in the production of these bands, you can, as an alternative to expensive diamonds. With the advanced development in manufacturing technology and design, precious stone, with whichsuch as a tape made and displayed in any type of design and style, similar to what should be done to the diamond.

Only experienced or trained eye can make the difference between a moissanite and diamond rings. It is a sort of rainbow lights that do not have diamonds. The other difference is that an expert could tell right away from moissanite rings, diamond and is one of the levels of hardness of the gem. Man-made gems are usually lesshard as diamond. This is why these stones are less preferred than diamonds for industrial use, such as cutting.

Moissanite rings are wearing the same feeling of wearing diamond rings because of the look and feel almost identical. Because of the lower price of this ring, you'll save a lot of money than if you buy a diamond ring. In these difficult times of economic uncertainty, every dollar you earn should be spent in good or alwaysa place for that matter, only very few people could afford to buy an expensive diamond ring. Many people were buying engagement rings and wedding bands prefer this way instead of the diamond for its price and still remember diamonds. This is a wise decision in relation to the recent economic situation.

Although expensive precious stones such as diamonds still considered a wise investment for the long term, because the value increases over time, few people couldin fact they do today. Moissanite rings could be the perfect choice, because they are convenient and has all the appearance and quality as diamond rings.

Do not measure the value of giving to the cost of moissanite rings, because it has its unique characteristics. Although it looks similar to diamonds, this band is different. It has a unique function of them and not to the diamond. Since the origin of these stones from outsidethis land, has the luster of the stars. And because the rings are a symbol of love, could this unique brilliance of moissanite rings overwhelming love you.